Implantation or period?

Hi, me and my husband are ttc, I'm new to all this ovulating tracking cm stuff. I have irregular cycles so when period comes it comes kind of thing but never anything I'm between. I'm 19 dpo I had brown spotting yesterday when I wiped sorry tmi
This morning wiped and was red so thought period. Then nothing all day until tonight was brown kind of stringy stuff now nothing again.. Do you think this could be implantation or start of my period. Sorry for long post and thank you in advance xx

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